Machine tool



R. L. KUEHN MACHINE TOOL Aug. 10, 1943.

Filed Dec. 1G, 1940 5 Sheets-Sheet l Aug. i0, 1943.

R. ,1., KUEHN MACHINE TOOL 3 Sheets-Sheet 2 Filed Deo. 16, 1940 Aug. 10,1943. R, KUEHN 2,326,541

MACHINE TOOL Filed Dec. 16, 1940 5 Sheets-Sheet 3 #frown/EY PatentedAug. 1o, 1943 221,3;263'541,l A :MACHINE Toor Raymond L. Kuchn,

Hartford,v Conn., assgnor to TheBillings & Spencer Company,` a:corporationA of Connecticut Application December` 16, 1940, serial No.0,342

21 claims. (o1. rsa-37)r n 1 This invention relates to machine tools.It; has among itsv objects to provide an improved machinetool of theso-called two-at-atime type described and claimed in the Kelly PatentNo.v 2,201,182, patented May 21; 1940,L

whereby it is made possibleV to extend the use of such machines' to.those uses, such, -for example, as the making of roller it is importantfor the pieces `to be. free from the burrs produced by the breakingoffof the same during cutting and before completion of the cutting oil'operation. A further object of thisinvention is to provide such animproved'l machine wherein the-pieces during the cutting' Aorf operationare grasped at their extremities by' work rotating means `rotatingsynchronously with Y the work spindles, so that these pieces-'areasev-Aered rcleanly from the stock by the cutting oiT' Withdrawn and ejected,"

tools; and subsequently n all through improved mechanism"cooperating-inthe desired sequence with the remainder ofthe Vmechanism of suchamachine.

object of this invention is to provide an'im'-` proved attachmentfor-such machines whereby the same may be adapted tolsuch vwork andincluding improved piece gripping, rotating', and lejectingmechanisr'ncontrolled manner and-adapted to be readily appliedtcl Aan existingmachine of standard-jconstruction."

These land'4 other objects `and advantages of this improvedconstructionwill, however;y here-A inafter morefully appear.v A

In the accompanying drawings, one form which the invention may assume infor vpurposes of illustration.`

In these drawings: Figure 1 is a side equipped with these improvements,the improvedv position wherein it is readyl its longitudinal carrier tofore the neXt cutting on operation;

Fig. 2 is La top plan view of a portionwof'the rnacl'iinre,v the workrotating and feeding mech-1 anism thereof beingbroken away andthecutting oiTV mechanism being omitted to Vfacilitate illustration; f*AFigl is a section on line .3i-3 of Figurel;

Fig, 4 is anv enlarged view.. generally similar to .Figure 3 andpartially in section online-,4 4 of Figure 1; Y

Fig. 5 is a sectional view onili-nes- Figure -3, the parts-.beingshownin the posi;-

tion which they koccupy while moving realwvardz.

bearings, lwherein in an improved practice is 'Ashownl Yelevation of aVmachine A Y'still further- Y spindles l n y operated through usualstockrotating.andieed-VV so; Y n fanismx 2,"to advance the :stockagainst' usual`A afrthecumng orf Operation and preach piece rejectingposition;

Fig'ye 6.-. is an `enlarged .section on linen-6 1 ing the forming Yoperation;

. Fig. 11 is'a'likeyewshowmgthe parts dur-v ing the cutting oilVoperation; andY Fig.f12 isa likeview showing thejnished piece' in.process yofejection. f j vi A The Ymachineshow'n in thisfillustrativeernv bodiment-includes a `plurality 'of horizontal work arranged"parallel to one-another and? ing mechanism. including usualfee'dingvmech;

swingingstock stops '3, while a' usual transversely movabler slide'.mechanism 4 carrying `forming tools 5is provided andlusual out oirlmechanism including verticalcutY off slides 6 carrying' cut oi tools 1iisalso provided; so that after the stock has engaged the' stock stops;these't'ools are'successively presented to the in rFigures ..10` and11`in a well known manner,-v hereinxto form bearing rollersfs; the:present in"-r ventioni being 'directed to f improved workl grip-v ping,rotating,` andejecting mechanism operat-I With l-the-aliove describeding inV timed: relation mechanisms andf'genrallyiindicated vat 9.-;

Herein this improved mechanism is carriedo'nA -avlongitudinallyfreciprocable carrier l0, heretofore `constitutingthelongitudinal disposed Aopposite the vv'Working vends of thespinoperated. by the usual main diesel` and 'on the' opposite `-sidethereof from the stock? stopsz, and

actuating cam lfl througha roller l2 tomove the Y and nomine work'ina`Well-1V known manner: after an initial forming operacarrier. UliVtoward tioni'an'dbeiore the Icutting oioperation; Here;howevensffwherein Vthe 'i slider l0 carries `the fimas theyapdiagrammatic viewshowing the stocktinfulllines oi operation and indotted 'linesasmoved forward into engagement withsthe .stock stop;

Fig.10isa'detailview showingV the parts dur-.v

work, as shown tool carrier? proved worky gripping, rotating, andejecting mechanism 8, it will be noted that the carrier I moves forwardinto such position as to enable the latter to grip the work during theoperation moves backward after of the forming tools and the work hasbeen cut on Aby the cutting off tools 1. Y c

Herein the work gripping', rotating,rand ejectf ing mechanismis providedin the form of an attachment adapted to be placed on the usu-alstandard'l3 provided on the carrier I0, in such manner as to enable astandard carrierv to used with a minimum of change. As showngvit alsoincludes upstanding brackets I4 suitably fixed to the opposite ends of`tliestandard I3 and projecting upward on oppositesidesof the coaxialshaiting, generally indicated at I5, which actuates the usualmechanism,-` not shown, for rotating the spindles l and operating thestock feeding mechanism 2 and the transverse and lvertical tool slides 4and 6 in. the desired' se,`

quence while also swinging the stock stop arms 3 into and out of theiroperative position shown inFigure `l. Herein, thesebrackets I4 areaperitured neartheirupperends to receive and pro-` videbearings for therotatablelunits vcomprising the work gripping and rotating jaws .mecha-`nisms and the controlling mechanisms thereon,v

these'unitsvbeing' generally indicated atI6 and hereinafter morespecii'lcallydescribed, while the brackets also have a transverse motorsupporting bracket .I1r supported ontheir tops `and suitably fixedthereto. and supporting a motor I8 centrally located above and havingit-s axis parallel tothc maineshaitin'g I5.i.It will also be observedthat'this motor has' apulley I9 Iand a V-belt: 20-v extending around'.thepulley IB and4 the mechanisms I5 are also moved toward the work sothat they may grip the same before cutting ofi and may move backwardwith the cut ofi pieces to cooperate with the controlling mechanism 29which isv always in a position to cooper-ate with them as they approachtheir backward limit of travel,

Referring more particularly to the mechanisms IB comprising the workgripping and rotating jaw"mechanism and their associated controlmechanisms, it will be noted that each of these includes alongitudinally extendnig collet carrying member 3D having a conicalmouth 3l in its end toward thegwork and a portion 32 of reduced externalVdiameter jcurnalled in suitable longitudinallyspaced ball bearings 33in the brackets I4,V lWhile these members 30 are located longitudinallywith respect to these brackets by nuts 34 and collars 34a at oppositeends of the bearings 33; As shown, each of these members 3i) is alsoprovided with a bore 35extending inwardashort distance from theconical-mouth 3 I, and also with acommunicating boreSIl of smallerdiameter intermediateithe ends of the member 30, while an inner annulargroove 31' is provided at the rear end ofeach member 3i! extending'rearward from the nut 34 within a reduced end'31a. `Within each vmember30, a collet 38-is disposed having usualspring jaws 39 movablelongitudinally relative to keys 39a on the member3 and each having arear conical portion engaging the conical mouth 3l; each of thesecollets hereinialso having an inner portion v4I), of reduced externalandginternal diameter, and aiurther inner portudinally `extending and.laterally curved slot 2liV in-a stationary `portion 21 on the standard;I3 between lthe brackets i4, in such manner astherebytoimpartthedesired reverse swinging move- Y ments to the stockVstop arms y3 which swing the same intorand out of the stock stopping'.position shownin Figure l, ina usual mannenpHere it will alsobe-observed that-this outer sleeve 24 alsoV carriesfarms128 aligned`with stock` stops 3i and carryingon their extremities controllingmechanisms, generally indicated at 29, cooperating WithrthefcontrollingI mechanisms reciprocable with the mechanisms I6,ashereinfafterdescribed; advantage here being taknfof the: fact that theY movementcof thisisleeve24 Yisalwayssuch as to cause the mechanisms. 2Salways -to bein the desired operative' relation vwith respect toitherevciprc'cable mechanisms-I5 mounted on the carrier I0 When-thedatteris'retractedgall1- in such Imanner asj to A`enablethese"controllingrrnechanisms 29 on thesearms 28 to control improvedelecting mechanism embodied V'in' the 'mechanisms I6, and hereinafterdescribed.` Thus, Vit willbe noted that the work gripping; rotating. and'ejecting mechanisms VIgherein are not only capa,.

ble offbeingrotatedcontinuouslyby the motor IIB,v vrbut rotatedvthereby. at the same. speed.. .that

thestock is rotated by the workspindles..v I, While.

tion 4I having a free sliding fit in-theportion 35 of thejaw carryingmember 3U. .As shown, a longitudinally extending sleeve member 42 ofsubstantially the same 'external diameterl as the internal-diameter-.ofthe sleeve member 32 of theL memberv30 is threaded to the portion 4I oneach collet,. and this sleeve memberis provided at its rearendwithanvannular collar 43Y .providing an outer/abutment for a coilfspring44 disposed in and abutting the end wall of the-annular groove 31` inthe member .30. A sleeve 45 is also longitudinallyreciprocable in thesleeve member 42 and an ejectorbperatingrod 48 is similarly mountedrinthe sleeve V45. As shown, the latter ing position shown inrFigure 6, theother end 5I Vof the rod in `this position'then -being disposed Within Athesleeve; 45,` as shown inathat figure. 4 Cooperating with the severalsleeves 42am; 45 and the rod46, is also improved controlling mechanismtherefor likewise comprised in the mechanismsl I6 and carried oneachmember 3i) and rotatable by leachpulleyy 2 I. As shown, therearwardfend' of the s1e'e`vej45 is .also rearwardly extended beyond thecollar 43,-as shown at 52, Here itcarriesareciprocable'-cam 53 having acylindrical rim portion 54 of maximum diameter and smaller diameter thanthe collar f43,Y and an adjacent intermediate tapered portion -55 ofldecreasing diameter and an outer cylindrical axial portion` 56', thiscam beingsuitably xed on the threadedportion 52 by a lock nut 51.Hereinthe pulley 2I is also suitably fixed on the protruding end 31a ofeach mernberz'!)Y and vthispulley carries 'a pair of oppositely locatedlatches 58 pivfoted at 59 vandmovable in radial slots 60 in the 55 the:memberI 5 .in certain positionsgof parte, jas .hereinafter described.;Herein, these latch mem-bers are' normally .pressed `inward by 1 coiledsprings .653 carriedon 'the .pulleys 22| land acting on the oppositesideyaof the portionsv .1 from the .latch engaging vportions :62 and'ES.

Cooperating with this controlling,r mechanism is also the improved.controlling mechanism -29 carried on the armspZS heretofore described..As shown, this last mentioned mechanism includes a sleeve 65 having one.end 6x6 engageable with the end vof the portion :52 and also having aplunger 6l movable therethrough and -engageaiole with the end -5l of therod '43% within the end'of the sleeve 5. As shown, theplungerfi alsohasn collar 68 therein normally projected by a -coiled spring' actingbetween the `latter and a nui', 10 closing the end of a spring housing'chamber lil in the member 165. Herein, the latter member is also fix-edin a suitable bushing r'12 extending throughvthe extremity of thearinZS, :and the sleeve E5 has a collar 73 thereon surrounding the nut'lil and engageablewith a suitable resilient abutment 'HlA such, forexample, as rubber, suitably iixed to abracketV 'i5 also xed to the Aarm28. Y

In the operation of this improved construction, with the parts intheposition show?L ,in Eigures l, 2- and 6, the worlgripping, rotatingandeject-4 ing mechanisms willA obviously he inoperativeduring the normaloperation ofthe stock eeding mechanism 2 and or the stock stops whilethe transverse slide fl will move Vitsorniing tools 5 in such manner asto form the stock, 'as shown in .Figurer 1Q preparatory Yto a cutting oioperation. Before the forming cpBl'ationbegin-s or shortly thereafter,however, the mechanisms l5 will be moved forward, i. e. away from thecon.- tiolling mechanism 253, suihciently to cause the projecting endotherstock to bereceived in the collet jaws Y39 ac -cordinghgtoengage theadev jacent end of the rod l and vmove the latter freely rearwardly.However, wlienthe end of the stock engages the adjacent end ot thesleeve d5, the cam 53 on the latter swings the latch members 'l from theposition shown inV Figure 6 in such manner to release the coiled springM which;

in turn, projects sleeve QE rearwardly, in. such manner as, through therearward movement et the collet jaws te cause the same to grip vthework, the parts.Y then assur g theposition sho-wn in Figure 7. This gripofV thecollet Ajaws 39 upon the work thus occurs while these jaws andthe' ene.; tire mechanismV i5 are rotating synchronously with thevstoel; and the spindles lj. Further, this rotation continues and thecarriagev i0 continues in its forward position throughout the remainderof the operation of the forming tools 5 and also.

throughcutthe operation or tne'cutting off tools l, the mechanismipreferahly continuing to be in this forward position wherein it isspaced longitudinally from theniechanism 28, while thetools, 5. andlVsuccessivelyassuine the'positions shown in Figures 1i) and l1. Thus,notonly is the work held firmly in position during the formingvoperation, but it continues to' 'oeso heldV and'togbe rotated with thestock at the same speed as the latter throughout the operational the'cutting. oil` tool l, so that the lattermay movepast the centerof thestock insuch'rnanner as therebytoinsure thev elimination of any, burr,lsince :thework piece Y 8 loeimgV supportedin the collet jaws: 39,.hence cannot drop form a burr as heretofore.l Y

' After* the. cutting oi operation has beenV com.

pleted, the mechanism S16` begins its rearward or retractive movement.wthithef carriage lil, the mechanism i5 .then retaining-the positionshown in Figure 7 and moving toward the position shown inFigure 5. When,however, the end 5i of the ejector rod 46 vengages thej projecting endof the spring plunger (il,4 as` shownin :Figure 5, the

plungerl is forcedzhackward in such manner as to-compless its spring E9.Further, as the mech- Y i6, continues to moverearwardly, the prontruding end 52 oi the sleeve' strikes theV pro: truding end 56 of thesleeve ,6E which .providesan afblltment preventing further rearwardkmovement o f the s1eeve'45rwhich, in turn,.prei-lentsfurtherrearwardinovement of the sleeveA 4 2! and conse-` quently causes thecoiled spring 151% to be com? lahorrequiredbut alsotc reduce, t, f )jif, j duction. These andotier"advantages of "To '393y releasahly .intheir forward pos ,legate pas such manner asnot` only materiallyto redt1pressed between collarvll andthe end wall of annulargroo-ve 3l. Thecollet jaws 35 will he opened as soon as the member 3i? has moved totheright relative to the fixed col-letk and its attached sleeve 42'sufcientlyvirorn thefposition shown inligure 5 to release the work,whilevas soon asj'these jaws open, the spring 65 then being released,Vthe plunger Sl will be also projected to v'the left against the ,end 5Iof the ejector rodli iii-such .mascaras therebrtofkick the work-niece eout( However, 'as a result or' this continued rearward-movement ofj themember of theopen collet jaw/s.v

3Q, the latches Aflwill also he carried.i'earward.ly from the positionshown in `Figure 5 in such Ina-n'- ner that theirsprings @will forcethem inwardly into. the position-:Shown in Fieurewheree their parallelsurfaces? engage the surfaces the Cam 53, Here it will also baunderstoodthatiin the next forward operation Yofthe 'mechanism i5 qirthecarriag'erl, as sooniasrthisgmechanism mOveS. forwardly sulciently ito.move; .the ex.-

treinity 5K2 out ofr Contact withl `the extremity $36 Y of thesleeve-5e, the radjacent faces ofthe; latches .5.3. Will .engage theCollar tohold theccllet jaws. again t the pressured serine-4.4 in. suchmeneer es thus. i@ permit the Geller laws 39,. toremairl. in their openposition ready to receive the ext piece, the end `5l of the ejector,redt-Sl then vprojecting ready FQ beginalswcycle.; A v Y As a result ofthisiinprove made-possible to s Construtioa i adapt atwog-at-a-,tirnemachine ofwusual construction tothe intended new uses;

with .a minimum of. expense, the vadditional mache @man beine carriedonthe .long-aumentarse. ciprocahle carrier l il gandthe outer, 'tubular shai 245 Further, itnwill` be apparent thatthework gripping, rotating,`rand electing. mechanism le is;

thus adaptedfto cooperate in'gthe -propeiujtinied relationfwith theother 'mechanisms-oi a standard machine and with the mechanism th'eworkheing gi'ippe'djwhendesired and ejected aftert'liefA I cutting 01T opel1ations,y without in any w f. lli-ese .0th .mech the addio-nel', h hepiecesfheretofo while 'eliminati grindingv oil or t re irriprovem'ents.will, however, cle rlfy y as. been riag `e z Same has been shown,fornurncssof illustration- Y and thattfhe-inventi0n mer leemodred and;e

bodied in other forms without departing from its spirit or the scope ofthe appended claims.

What is claimed as new and desired secured by Letters Patent is: l

1. In a work gripping and rotating mechanism, a constantly rotatingreciprocable collet carrier, a collet thereon 'for gripping andreleasing the' work in diierent operative positions of said collet, andmechanism for controlling the operation of said collet including meansbiasing said collet into one operative position and latch means forholding the collet against said biasing means to maintain said collet inthe other operative position.

2. vIn a work gripping and rotating mecha;- nism, collet mechanismincluding a constantly to be rotatable reciprocable collet carrier,' acollet thereon for gripping and releasing the Work in diierent operativepositions of said collet, means biasing the collet to one operativeposition thereof, and mechanism controlling the action of said colletincluding latch means normally maintaining the collet against movementinto said operative position by said biasing means, and means controlledby the work received in said collet for releasing said latch means. Y

3. In a work gripping and rotating mechanism, collet mechanism includinga-constantly rotating reciprocable collet carrier, a normallyv opencollet biased to work gripping position therein, and mechanismcontrollingthe work gripping action of isaid collet including latchmeans on said carrier normally holding said collet against its bias andmeanscontrolled by the work received in said collet `for releasingcsaid,

latch means. I v

vv4:. In a work gripping vand rotating mechanism, collet mechanismincluding/a 'constantly rotatingreciprocable collet carrier, a normallyopen collet biased to work gripping position therein, and mechanismcontrollingthe work gripping action of said'collet including latch meanson saidV carrier normally holdingA said collet against its bias and areciprocable Vcam carrying member' actuated by work received in` saidcollet for releasing said latch means.

Y5. In al work-gripping and rotating mechanism, colletmecha-nismVincluding aconstantly rotating reciprocable collet carrier.` a colletbiased to work gripping position therein, and mechanism controlling thework gripping action of said collet including latch' means on saidcarrier for normally holding said collet against its bias, '-areciprocable cam carrying member actuated by work received Yinsaid'collet for releasing said latch means, andan abutment engageable bysaid cam carrying member for limiting the longitudinalmovement 'of saidcam carrying-member in one direction upon reciprocation of said carrier.A l

6. In a work grippingand rotating VYmecha.- nism, collet mechanismincluding a constantly rotating reciprocable collet' carrier, a normallyopen collet biased to work gripping position therein, mechanismcontrolling the work -gripping action ofvisaid collet including latchmeans on said carrier normally `holding said collet' against its bias,.and ejector mechanism controlled by said latch means.

-'7. In a workvgripping and `rotating 'r'nechanism, collet mechanismincluding aconstantly rotatingreciprocable Vcollet carrierja colletrotatable therewith and reciprocable` relative thereto andl havingAspring 'means biasing jsaid collet to work `gripping-'position andacting be-l` tween said carrier and said collet, and means controllingthe operation ofy said collet including an abutment on Asaidscollet', alatch controlling member extending throughsaid collet and actuated byawork piece therein, a cam on said controlling member adjacent saidlabutment, latch mechanism rotating with said carrier andcooperating'withsaid abutment and cam,V and a stationaryabutment engageable by saidlatch controlling member andy controlling saidlatch mechanism. e

8. In a work gripping-*and rotating mechanism, collet mechanismincluding a constantly rotating reciprocable collet carrier, a colletrotatable therewith and reciprocable relative thereto and having springmeans biasing said collet to work gripping position and acting betweensaid carrier and said collet, and means controlling the operation. ofsaid collet including an abutment on said collet, a latch controllingmember extending through said collet and actuated by a work piecetherein, a cam on said controlling vmember adjacent said abutment, latchmechanism rotating'with said carrier'and cooperating with said abutmentand cam, `a stationary abutment engageable by lsaid latch controllingmember and controlling said latch mechanism, and ejector mechanismincluding an ejector member extending axially through said latchcontrolling member and reciprocable therewith and engageable with thework, and spring pressed ejector means carried by said stationaryabutment and acting on said ejector member and controlledby said latchmechanism.

9; In a work gripping and rotating mechanism, collet mechanism includinga constantly rotating reciprocable collet carrier,` a collet rotatable.therewith and reciprocable relative thereto and having spring meansbiasingA said collet to work gripping position and acting between saidcarrier and said collet, and means controlling the operation of saidcollet including an abutment on said collet, a latch controlling memberextending through said collet and actuated by a work piece therein, acam on said control pressed latch member holding said cam and said firstmentioned abutment against relative longi- V tudinal movement in thework engagingposition of the collet and Yreleasable vwhen said camstrikes said second mentionedv abutment to effect said relativelongitudinal "movement to release the work piece. t

10, Ina work gripping and rotating mechanism,l collet mechanismrincluding aconstantly rotating reciprocable 'collet carrier, a colletrotatable therewith and reciprocable relative thereto `and having springmeans biasing said rcolletrto'work gripping position and acting betweensaidV carrier'andt said collet, and means controlling the operation-ofsaid collet'including an abutment on said collet, a latch controllingmember extending through said collet and Vactuated by a work piecetherein, a cam on said controlling member ladjacent "said abutment, f

latch mechanismlrotating with said carrier and cooperating with saidabutment and cam, a stationary abutment engageable by said latch con-ltrolling VVmember and controlling said latchl mechanism, said latchmechanism comprising a Vclose the latter,

galega-$4.1

spring .pressed'latch member cooperating..with

said abutment tomaintain the colletriny open position as saidV carrierandcollet move .toward the work and said latch lmember being vreleased'.by said .cam when said latch controlling memrelease said abutment berengages the Work' to effect relative reciproactuated by awork-piecetherein, a camion said x controlling member adjacent said abutment,latch mechanism rotating with said 'carrier and cooperating with saidabutment rand.cam, 1a stationary abutment engageable by: saidlatchcontrolling. member and :controllingl said `latch mechanism, saidlatch mechanism comprising a spring pressed latch member-holdingsaidf'cam andrsaid 'mst mentioned abutment. against reliativelongitudinal movement `in the work engaging position.ofthecolletand'releasable when said cam strikes said secondmentioned abutmenttoeffect piece, andfejeotor `mechanism including an ejector member-reciprocable axially in saidlatch controliingmember and a cooperating'spring pressed plunger Iin said stationary abutment acting upon saidejector member. to discharge the work piece from the collet when thelatter releases the piece.

l2, In a work gripping and rotating mechanism, collet mechanismincluding a constantly rotating reciprocable collet carrier, a colletrotatable therewith and reciprocable relative thereto and having springmeans biasing said collet to work gripping position and acting betweensaid carrier and said collet, and means controlling the operation ofsaid collet including an abutment on said collet, a latch controllingmember extending through said collet and actuated by a work piecetherein, a cam on said controlling member adjacent said abutment, latchmechanism rotating with said carrier and cooperating with said abutmentand cam, and a stationary abutment engageable by said latch actuated bya work piece therein, a cam on said 'l controlling member adjacent saidabutment,

' actuated 4by a work piecel therei-nfafcam `onisad said relativelongitudinal move- K ment to `release the.` workV relative latchmechanism rotating with said carrier and abutment and cam, and astationary abutment engageable by said latch controlling member andcontrolling said latch Y"when fthe ing portions one of which: 'of'meco-liet engages said engages said nrst mentioned abutment toma-intainthe collet open 'collet toward the Work V14. Inpa Work grippinglandarotatimg mechanism, collet lmechanism-1:inclmiirr'g afconstantliyrotating reciprocable collet carrier, v a

'controlling the opera-tion 'of said s :collet 'sincluding an abutment:onesaid ycoiletgia latchV controlling member :extending through. lsaidcontrolling member' adjacent said i'abutmen-t,

laten mechanism @rotating-winnend carrier andY cooperating with .saidvabutment 'a stationaryA abutment engageable 'by said `latch `l'atching.portion holding said -irstfinenti'one'd abutment against -inovement:relative to said car'- rier as the collet approaches .theWork,.:andfsa'id latch mechanism :being movable ,fbyfsaidcam memberutorelea'seprsaid abutment-and permit suiicient `rrelai-,ive movementlbetween.fthe:carir-ier and the collet. to ."eiect :gripping i'ofrthe'work.

In 'a --machine tool.having-parallelartwork,

`between, the` same, a,oarrierereciprocablelongieach spindle rotatableat the same speed as said I .Spindles. A 16. In a machine tool havinglparallel work;

mechanism, said laten mechamsm having. latch! .in f the. open li:nsition cam while the otherv during 'movement lof" said collet tro-l n'tatable therewith. and -u-i-'eciprocable relative collet-Jann 'and'controlling said latchk mechanism, said 'latchcmechanism having V:a

work engages l:saidlatch"controlling sides-0f `said shaftmg includingaf; f constantly rotating work gripping mechanism for j nism controlledby the reciprocation of said carkdinally'toward and dles inltimedrelation tov said iorming'and cutrier for :actuating saidrgrippingmechanisms to grip and rotate the work during the cutting off operationand to eject the work as the carrier is retracted.

18. In a machine tool having parallel work Y each spindle rotatable atthe .same speed as said spindle, and automatic mechanismr controlled bythe vreciprocation of said carrier for actuating said grippingmechanisms to. grip and rotate the work during `the cutting .offoperation and to eject the workas the carrier is retracted includingvabutments movable with said stock stop mechanism. f

19. Ina machine; tool having parallel work rotating spindles,transversely movable forming and cutting off mechanisms operating onwork therevin, driving. shaftingi for saidmechanisms and spindlesextendingparallel to said spindles between the same, a carrierreciprocable longitufrom the Workin said spin'- 4ting oimechanismsVstock stop mechanism ac-' tuatedby said carrier-,workgripping and rotating mechanisms mounted on said carrier and on oppositesidesof' saidl shafting including a constantly rotating work grippingmechanism for work gripping and rol said shafting including aconeachspindle rotatable at the same speed as said spindle, andv automaticmechanism controlled by the reciprocation of said carrier. for actuatingsaid gripping mechanisms to grip and rotate .the Work during the cuttingofi operation'and to eject the work asthe carrier is retracted includ--ing abutments movable with said stock stop mechanism, and ejectormechanism. including ejector members carried by said work grippingmechanisms and actuating'mechanism for said ejector members carriedbysaid abutments.

20. An attachment for machine tools comprising a longitudinallyreciprocable carrier, upstand- Aing supports on oppositepsides thereofproviding arpassage therebetweenifor actuating shafting, work grippingmechanisms journalled in said supportsgra motor having a support carriedon said supports and disposed above said work gripping mechanisms andthe shafting passage therebetween, and driving connections between saidmotor and said work gripping mechanisms.

2l. An attachment for machine tools comprising a longitudinallyreciprocablecarrier, upstanding supports on opposite sides thereofproviding a passage therebetween for actuating shafting, work grippingmechanisms journalled in said supports, a motor'having a support carriedon said supports and disposed above said work gripping mechanisms'andthe shafting passage therebetween and having its axis parallel to saidpassage, and driving connections between said mo- Y ltor and said workgripping mechanisms including pulleys on said motor and work grippingmechanisms, a belt connecting said pulleys-and an adjustable pulleycarried on the motor support .below the latter for adjusting the tensionof said belt.

RAYMOND L. KUEHN.

